Charlie relaxed and reached the top (7)
I believe the answer is:
crested
'reached the top' is the definition.
(I've seen this before)
'charlie relaxed' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet).
'relaxed' becomes 'rested' (I've seen this before).
'c'+'rested'='CRESTED'
'and' acts as a link.
(Other definitions for crested that I've seen before include "Plumed; reached the top" , "like some newts" , "With plume on helmet" , "Got to top of hill" , "See 8" .)