Outsiders to stage child's play, a blow for Brighton? (3,6)
I believe the answer is:
sea breeze
'a blow for brighton?' is the definition.
(Brighton is by the sea)
'outsiders to stage child's play' is the wordplay.
'outsiders to' means to remove the middle letters (only letters on the outside of the word).
'child's play' becomes 'a breeze' (both can mean something very easy).
'stage' with its centre removed is 'se'.
'se'+'abreeze'='SEA-BREEZE'
(Other definitions for sea breeze that I've seen before include "Gentle wind from the ocean" , "Gentle coastal wind" , "Doctor" , "that creates a cool ambience around 6 [ISLE] ?" , "Vodka-based cocktail" .)