Top part of UK for cider and nice apple (7)
I believe the answer is:
sweater
'top' is the definition.
(type of top or jumper)
'uk for cider and nice apple' is the wordplay.
I cannot quite understand how this works, but
'apple' could be 'eater' (I've seen this before) and 'eater' is found in the answer.
This explanation may well be incorrect...
'part of' is the link.
Can you help me to learn more?
(Other definitions for sweater that I've seen before include "Heavy jersey" , "Knitted upper garment" , "Long-sleeved pullover" , "slave-driver" , "Warm garment" .)