Chances of getting an occasional letter (4)

I believe the answer is:

odds

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'chances of' is the definition.
'odds' can be an answer for 'chances' (the odds of something happening). I'm unsure of the 'of' bit.

'an occasional letter' is the wordplay.
'an occasional' becomes 'odd' (odd can mean occasional or infrequent).
'letter' becomes 's'.
'odd'+'s'='ODDS'

'getting' is the link.

Can you help me to learn more?

(Other definitions for odds that I've seen before include "Partial darkness" , "Betting rates" , "Probabilities" , "Indicator of likely betting winnings" , "Likelihood of something happening" .)

I've seen this clue in the Evening Standard.

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