Recall failure of clumsy seaman to gather sails in the middle (7)
I believe the answer is:
amnesia
'recall failure' is the definition.
The answer and definition can be both related to thinking as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'clumsy seaman to gather sails in the middle' is the wordplay.
'clumsy' indicates anagramming the letters.
'to gather' is an insertion indicator.
'in the middle' indicates the central letters.
The middle letter of 'sails' is 'i'.
'seaman' is an anagram of 'amnesa'.
'amnesa' enclosing 'i' is 'AMNESIA'.
'of' is the link.
Can you help me to learn more?
(Other definitions for amnesia that I've seen before include "Completely forgetting" , "Is a name (anag.)" , "Severe forgetfulness" , "Main sea (anag.)" , "Medical condition" .)