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' anagrams to 'MISLAID'.
However, I'm not sure how the anagram is indicated.

'getting' is the 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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