A number walk wearily around - it's hard work (7)

I believe the answer is:

travail

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'hard work' is the definition.
(travail can mean hard work or effort)

'a number walk wearily around it's' is the wordplay.
'number' becomes 'V' (V is an example).
'walk wearily' becomes 'trail' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'around it' indicates putting letters inside.
'a'+'v'='av'
'av' placed within 'trail' is 'TRAVAIL'.

Can you help me to learn more?

(Other definitions for travail that I've seen before include "In old use, the pains of childbirth" , "Old word for pangs of childbirth" , "Painful labour" , "painful exercise" , "Hard labour" .)

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

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