Extinct bird seen finally biting wings of gulls in Lewis? (7)
I believe the answer is:
dodgson
'lewis?' is the definition.
(Lewis Carroll's real name was Charles Dodgson)
'extinct bird seen finally biting wings of gulls' is the wordplay.
'extinct bird' becomes 'dodo' (dodos are extinct).
'finally' suggests the final letters.
'biting' means one lot of letters goes inside another (some letters bite or swallow others).
'wings of' says to hollow out the word (remove centre letters) (letters on the two wings removed).
'gulls' with its middle removed is 'gs'.
The last letter of 'seen' is 'n'.
'dodo'+'n'='dodon'
'dodon' placed around 'gs' is 'DODGSON'.
'in' acts as a link.
(Other definitions for dodgson that I've seen before include "Author" , "Victorian don" , "Lewis Carroll's real family name" , "Lewis Carroll's real surname" , "Real name of Lewis Carroll" .)