Bird's woeful cry going round Margate occasionally (7)
I believe the answer is:
wagtail
'bird's' is the definition.
(wagtail is a kind of bird)
'woeful cry going round margate occasionally' is the wordplay.
'woeful cry' becomes 'wail' (wailing is a kind of crying. I am not sure about the 'woeful' bit.).
'going round' means one lot of letters goes inside another (some letters go around others).
'occasionally' means one should take alternating letters (letters taken at regular intervals or occasions).
The alternate letters of 'margate' are 'agt'.
'wail' placed around 'agt' is 'WAGTAIL'.
Can you help me to learn more?
(Other definitions for wagtail that I've seen before include "Songbird - gala wit (anag)" , "Common bird" , "'Bird, its posterior projection jerks up and down (7)'" , "Slender songbird - a law git (anag)" , "singer" .)