Transport initially included in price of holiday (4)
I believe the answer is:
fete
'holiday' is the definition.
(fete can mean a festival or holiday)
'transport initially included in price' is the wordplay.
'initially' indicates taking the first letters.
'included in' indicates putting letters inside.
'price' becomes 'fee' (price paid for a service).
The first letter of 'transport' is 't'.
't' put inside 'fee' is 'FETE'.
'of' is the link.
(Other definitions for fete that I've seen before include "A festival of feet" , "(Honour with) festivities" , "Outdoor entertainment or sale, may be for charity" , "Celebrate; village fair" , "Outdoor bazaar for charity" .)