Crossword Genius

One's achievement in not missing 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 missing a trick?' is the definition.
I can't judge whether this definition defines the answer.

'one's achievement' is the wordplay.
'one's' becomes 'grands' (I can't justify this - if you can you should believe this answer much more).
'achievement' becomes 'lam' (lam is a kind of achievement).
'grands'+'lam'='GRAND SLAM'

'in' is the link.

Can you help me to learn more?

(Other definitions for grand slam that I've seen before include "Top bid in bridge" , "Feat of winning all the tricks in a hand of bridge" , "It's extremely tricky" , "Winning of all tricks (or major tournaments)" , "Success at table" .)

I've seen this clue in The Independent and The Telegraph.
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