Bird used by the Poles to make pie? (5)
I believe the answer is:
snipe
'bird' is the definition.
(snipe is a kind of bird)
'by the poles to make pie?' is the wordplay.
'by' means one lot of letters go next to another.
'the poles' becomes 'SN' (North and South poles).
'to make' indicates anagramming the letters.
'pie' is an anagram of 'ipe'.
'sn' put next to 'ipe' is 'SNIPE'.
'used' acts as a link.
(Other definitions for snipe that I've seen before include "From concealed position, shoot" , "river bird" , "Pines like wading bird" , "Verbal criticism" , "Wading bird with long straight bill" .)