I'd a slim chance of getting lost (7)

I believe the answer is:

mislaid

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

'lost' is the definition.
('mislay' can be a synonym of 'lose')

'i'd a slim chance of' is the wordplay.
'i'd a slim' can be anagrammed to 'MISLAID'.
However, I am not sure how the anagram is indicated.

'getting' acts as a link.

Can you help me to learn more?

(Other definitions for mislaid that I've seen before include "Temporarily lost" , "not to be found?" .)

I've seen this clue in the Evening Standard.

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