Holidaymaker’s escapade entertaining Mike (6)
I believe the answer is:
camper
'holidaymaker's' is the definition.
(I've seen this before)
'escapade entertaining mike' is the wordplay.
'escapade' becomes 'caper' (I've seen this in another clue).
'entertaining' is an insertion indicator.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'caper' enclosing 'm' is 'CAMPER'.
(Other definitions for camper that I've seen before include "more affected?" , "Van in which to live on the road" , "Tent resident" , "Overnight van" , "Holidaymaker with tent" .)