Paddy's Pride ivy - thick at top, leaves dropped from bottom - what to do?

This Paddy's Pride ivy is thick at the top, but a lot of the leaves have dropped from its lower part. It's west facing but in summer it gets a lot of direct sunlight. It could be in the wrong place because I think Paddy's Pride prefers shade, although it is supposed to flourish in full sun.
Is now (early March) a good time to snip its branches about six inches above the soil and then remove all the foliage, so that it can start again?
Or is it the wrong climber for a planter in such a sunny and exposed position, against a brick wall? If so, which evergreen climbers would people suggest for such a position? Thanks.

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I doubt it gets enough moisture in that container to do it's job properly. Anything in a pot long term needs a soil based medium too, so if it doesn't have that, it may do better if you replace the soil.
Dropping foliage is perfectly normal in all evergreens, but it may be dropping more to help conserve itself.
Ivies tend to grow in that top heavy way anyway when contained at the base.