Think to study model (11)
I believe the answer is:
contemplate
'think' is the definition.
(contemplating is a kind of thinking)
'study model' is the wordplay.
'study' becomes 'con' (I've seen this before).
'model' becomes 'template' (template is a kind of model**).
'con'+'template'='CONTEMPLATE'
'to' is the link.
(Other definitions for contemplate that I've seen before include "Ponder" , "Think seriously" , "Look at thoughtfully" , "Ruminate on" , "Consider" .)