Hardy girl acquires old place, revealing chest (7)
I believe the answer is:
topless
'revealing chest' is the definition.
'hardy girl acquires old place' is the wordplay.
'hardy girl' becomes 'tess' (**).
'acquires' is an insertion indicator.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'place' becomes 'pl' (I've seen this in other clues).
'o'+'pl'='opl'
'tess' placed around 'opl' is 'TOPLESS'.
(Other definitions for topless that I've seen before include "Leaving the breasts uncovered" , "With chest totally exposed" , "Half naked" , "Without a shirt, vest or bra?" , "Revealing" .)