Most keen to play with the tots (7)
I believe the answer is:
hottest
'most keen' is the definition.
Both the definition and answer are superlative adjectives. Maybe you can see a link between them that I can't see?
'play with the tots' is the wordplay.
'play with' indicates anagramming the letters (I've seen 'plays with' mean this (I've seen this in other clues)).
'the'+'tots'='thetots'
'thetots' anagrammed gives 'HOTTEST'.
'to' is the link.
Can you help me to learn more?
(Other definitions for hottest that I've seen before include "Most fashionable" , "Of the highest temperature" , "Least cold" , "Most torrid" , "Most heated" .)