Crossword Genius

Requirement to carry over long pencil, say (9)

Ross

I believe the answer is:

moustache

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'long pencil say' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'requirement to carry over' is the wordplay.
'requirement' becomes 'must' (I've seen this in another clue).
'to' becomes 'ache' (I can't justify this - if you can you should believe this answer much more).
'carry' indicates putting letters inside.
'over' becomes 'o' (cricket abbreviation).
'must'+'ache'='mustache'
'mustache' going around 'o' is 'MOUSTACHE'.

Can you help me to learn more?

(Other definitions for moustache that I've seen before include "Facial feature" , "Hair on upper lip" , "Facial hair growth" , "Facial hair touches Ma" , "whiskers" .)

I've seen this clue in The Times.
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