Crossword Genius

One’s achievement having not missed a trick? (5,4)

Ross

I believe the answer is:

grand slam

I'm a little stuck... Click here to teach me more about this clue!

'not missed a trick?' is the definition.
I can't judge whether this defines the answer.

'one's achievement' is the wordplay.
'one's' becomes 'grands' (I can't explain this - if you can you should give a lot more credence to this answer).
'achievement' becomes 'lam' (lam is a kind of achievement).
'grands'+'lam'='GRAND SLAM'

'having' acts as a link.

Can you help me to learn more?

(Other definitions for grand slam that I've seen before include "wiping the floor with the others" , "achievement at the table" , "ambitious contract" , "Winning every trick or match" , "sporting triumph" .)

I've seen this clue in The Times.
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