Train manoeuvred round in the morning for a monkey (7)
I believe the answer is:
tamarin
'monkey' is the definition.
(tamarin is a kind of monkey)
'train manoeuvred round in the morning' is the wordplay.
'manoeuvred' indicates an anagram.
'round' is an insertion indicator.
'in the morning' becomes 'am' (short for ante meridiem - before noon).
'train' is an anagram of 'tarin'.
'tarin' enclosing 'am' is 'TAMARIN'.
'for a' acts as a link.
(Other definitions for tamarin that I've seen before include "Main art (anag) - monkey" , "Small monkey of the marmoset family" .)