Crossword Genius

Youth with no head for multiplication (8)

Ross

I believe the answer is:

tripling

'for multiplication' is the definition.
(tripling is a kind of multiplication)

'youth with no head' is the wordplay.
'youth' becomes 'stripling' (I've seen this before).
'with no head' means to remove the first letter.
'stripling' with its first letter taken away is 'TRIPLING'.

(Another definition for tripling that I've seen is " Increasing threefold".)

I've seen this clue in The Globe and Mail.
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