Hair treatment in Torquay area given to sound swimmer (5,5)
I believe the answer is:
sperm whale
'swimmer' is the definition.
'hair treatment in torquay area given to sound' is the wordplay.
'hair treatment' becomes 'perm'.
'in' indicates putting letters inside.
'torquay area' becomes 'sw' (torquay is in south west england).
'given to' is a charade indicator (letters next to each other).
'sound' becomes 'hale' ('hale' can be a synonym of 'sound'**).
'perm' inserted within 'sw' is 'spermw'.
'spermw'+'hale'='SPERM-WHALE'
(Another definition for sperm whale that I've seen is " Marine mammal (cachalot)".)