Composer who got crotchety with 1? (7)
I believe the answer is:
strauss
'composer who got crotchety with 1?' is the definition.
'strauss' can be an answer for 'composer' (I've seen this before). I am not certain of the remainder of the definition.
'composer who' is the wordplay.
'composer' becomes 'straus' (Oscar Straus).
'who' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'straus'+'s'='STRAUSS'
(Other definitions for strauss that I've seen before include "scorer" , "34 [CRICKETER]" , "Composer of Blue Danube waltz" , "Johann -, The Waltz King (or his father)" , "Johann ......, the Viennese waltz king" .)