Desert included in summer itinerary (5)
I believe the answer is:
merit
'desert' is the definition.
(thesaurus)
'included in summer itinerary' is the wordplay.
'included in' indicates a hidden word.
'MERIT' can be found hidden inside 'summer itinerary'.
(Other definitions for merit that I've seen before include "Deserve or warrant" , "Deserve, be worthy of" , "Excellence that deserves to be honoured" , "Good point or quality" , "Earn" .)