Conceal British identity somewhat (4)
I believe the answer is:
hide
'conceal' is the definition.
(synonyms)
'british identity somewhat' is the wordplay.
'somewhat' says the answer is hidden in the clue.
'HIDE' is hidden within 'british identity'.
(Other definitions for hide that I've seen before include "Pelt; conceal" , "go to ground" , "Conceal with leather" , "Keep quiet" , "Bury" .)