Set learner with support (4)
I believe the answer is:
laid
'set' is the definition.
('laid' can be a synonym of 'set')
'learner with support' is the wordplay.
'learner' becomes 'l'.
'with' means one lot of letters go next to another.
'support' becomes 'aid' ('aid' can be a synonym of 'support'**).
'l'+'aid'='LAID'
(Other definitions for laid that I've seen before include "Produced (an egg)" , "settled" , "Placed horizontally on a surface" , "spread on a surface" , "The clutch must be" .)