Boxer curious about time to start (5)
I believe the answer is:
tyson
'boxer' is the definition.
(Tyson Fury the boxer)
'curious about time to start' is the wordplay.
'curious' becomes 'nosy' (similar in meaning).
'about' says the letters should be written backwards.
'time' becomes 't' (abbreviation).
'to start' means one lot of letters go next to another.
'nosy' back-to-front is 'yson'.
'yson' put after 't' is 'TYSON'.
(Other definitions for tyson that I've seen before include "American world heavyweight champion, b. 1966" , "Mike ..., former US prizefighter" , "Youngest ever undisputed world heavyweight boxing champion, b, 1966" , "26 4 [RING MASTER]" , "US world heavyweight boxing champion, b.1966 -- English fast bowler, d. 2015" .)