College let head show some inexperience (10)

I believe the answer is:

callowness

'some inexperience' is the definition.
(thesaurus)

'college let head' is the wordplay.
'college' becomes 'c'.
'let' becomes 'allow' (synonyms).
'head' becomes 'ness' (ness is a headland).
'c'+'allow'+'ness'='CALLOWNESS'

'show' acts as a link.

I've seen this clue in The Guardian.

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