Crossword Genius

Story which has no beginning: it can go to one’s head (7,3)

Ross

I believe the answer is:

porkpie hat

'it can go to one's head' is the definition.
(a porkpie hat might be worn on your head)

'story which has no beginning' is the wordplay.
'story' becomes 'porkpie' (I've seen this before).
'which' becomes 'what' (I've seen this in other clues).
'has no beginning' means to remove the first letter.
'what' with its first letter taken off is 'hat'.
'porkpie'+'hat'='PORKPIE HAT'

I've seen this clue in The Times.
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