Crossword Genius

No rest with guy's new child (9)

Ross

I believe the answer is:

youngster

'child' is the definition.
(synonyms)

'no rest with guy's new' is the wordplay.
'with' says to put letters next to each other.
'new' is an anagram indicator.
'no'+'rest'='norest'
'norest' put after 'guy' is 'guynorest'.
'guynorest' with letters rearranged gives 'YOUNGSTER'.

(Other definitions for youngster that I've seen before include "tyke" , "one of tender years" , "Adolescent" , "Child, minor" , "Kid" .)

I've seen this clue in The Telegraph.
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