Robin Hood's band announced time for revelry (9)
I believe the answer is:
merriment
'for revelry' is the definition.
(thesaurus)
'robin hood's band announced time' is the wordplay.
I cannot quite understand how this works, but
'band' could be 'rim' (rim is a kind of band) and 'rim' is located in the answer.
'time' could be 't' (abbreviation) and 't' is located in the answer.
This explanation may well be incorrect...
(Other definitions for merriment that I've seen before include "laughing maybe" , "Jollity" , "Joy" , "Gaiety, laughter, fun" , "Hilarity" .)