Join freezing cold leaves in seed put away (11)
I believe the answer is:
participate
'join' is the definition.
(thesaurus)
'freezing cold leaves in seed put away' is the wordplay.
'freezing cold leaves' becomes 'artic' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'seed' becomes 'pip' (as in a fruit pip).
'put away' becomes 'ate' (put away can mean to eat).
'artic' inserted within 'pip' is 'particip'.
'particip'+'ate'='PARTICIPATE'
Can you help me to learn more?
(Other definitions for participate that I've seen before include "Be involved (in)" , "Take part (in activity)" , "Contribute" , "Join in" .)