Posh chap having time away (4)
I believe the answer is:
toff
'posh chap' is the definition.
(I've seen this before)
'time away' is the wordplay.
'time' becomes 't' (abbreviation).
'away' becomes 'off' (synonyms).
't'+'off'='TOFF'
'having' is the link.
(Other definitions for toff that I've seen before include "In slang, a posh person" , "Nob" , "Rich person (colloq.)" , "Dandy" , "Person of the upper classes" .)