Undoubted restrictions for red-hot tips (11)
I believe the answer is:
certainties
'red-hot tips' is the definition.
The answer and definition can be both related to thinking as well as being plural nouns.
Perhaps you can see an association between them that I can't see?
'undoubted restrictions' is the wordplay.
'undoubted' becomes 'certain' (I can't explain this - if you can you should believe this answer much more).
'restrictions' becomes 'ties'.
'certain'+'ties'='CERTAINTIES'
'for' is the link.
Can you help me to learn more?
(Another definition for certainties that I've seen is " True facts".)