Straitlaced girl with satellite receiver (7)
I believe the answer is:
prudish
'straitlaced' is the definition.
(I know that straitlaced can be written as prudish)
'girl with satellite receiver' is the wordplay.
'girl' becomes 'pru' ().
'with' means one lot of letters go next to another.
'satellite receiver' becomes 'dish' (satellite dish).
'pru'+'dish'='PRUDISH'
(Other definitions for prudish that I've seen before include "Having exaggerated propriety, easily shocked" , "Prissy" , "Excessively prim" , "Strait-laced" , "not liking anything too hot!" .)