Britten primarily a children's composer? (4)
I believe the answer is:
bach
'composer?' is the definition.
(Bach is an example)
'britten primarily a children's' is the wordplay.
'primarily' indicates taking the first letters.
'children' becomes 'ch' (genealogical abbreviation).
The initial letter of 'britten' is 'b'.
'b'+'a'+'ch'='BACH'
(Other definitions for bach that I've seen before include "German organist and composer, d. 1750" , "Brandenburg Concertos composer, d. 1750" , "Johann Sebastian . . . . , great composer (4)" , "endearing Welsh appellation" , "German baroque composer, d. 1750" .)