Rock like that in chest (5)
I believe the answer is:
torso
'chest' is the definition.
(a person's chest)
'rock like that' is the wordplay.
'rock' becomes 'tor' (a tor is a rocky peak).
'like that' becomes 'so' (as in 'like so').
'tor'+'so'='TORSO'
'in' is the link.
(Other definitions for torso that I've seen before include "Main part of human body" , "unfinished work" , "Roost on trunk?" , "Body's core" , "Body (excluding head, neck and limbs)" .)