Tom put out with diet not included (7)
I believe the answer is:
omitted
'not included' is the definition.
The definition and answer can be both related to thinking as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?
'tom put out with diet' is the wordplay.
'put out with' is an anagram indicator.
'tom' mixed up with 'diet' can make 'OMITTED'.
Can you help me to learn more?
(Other definitions for omitted that I've seen before include "Left out, probably forgot" , "Disregarded" , "Musical aptitude" , "Missed out" , "Cardigan boy" .)