Birds as seen around Britain (4)
I believe the answer is:
auks
'birds' is the definition.
(auk is a kind of bird)
'as seen around britain' is the wordplay.
'seen around' means one lot of letters goes inside another.
'britain' becomes 'UK' (synonyms).
'as' placed around 'uk' is 'AUKS'.
(Other definitions for auks that I've seen before include "Fliers" , "Northern black and white diving birds" , "Stocky diving birds" , "Birds (such as razorbills)" , "Sticky diving seabirds" .)