With only myself to count on (6)

I believe the answer is:

merely

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'with only' is the definition.
'merely' can be an answer for 'only' (I've seen this before). I am not certain of the 'with' bit.

'myself to count on' is the wordplay.
'myself' becomes 'me'.
'to count' becomes 'rely' (I've seen this before).
'on' says to put letters next to each other.
'me'+'rely'='MERELY'

Can you help me to learn more?

(Other definitions for merely that I've seen before include "'Only, and nothing more (6)'" , "Simply - only" , "Just one" .)

I've seen this clue in the Evening Standard.

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