Put in the picture, relaxing in the glen (9)
I believe the answer is:
enlighten
'put in the picture' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'relaxing in the glen' is the wordplay.
'relaxing' is an anagram indicator.
'in'+'the'+'glen'='intheglen'
'intheglen' with letters rearranged gives 'ENLIGHTEN'.
Can you help me to learn more?
(Other definitions for enlighten that I've seen before include "Make aware" , "Brief" , "Free from ignorance" , "free from superstition" , "Give knowledge to, inform" .)