One with good cause to be a fare dodger? (6-7)

'be a fare dodger?' is the definition.
The definition suggests a singular noun which matches the answer.

'one with good cause' is the wordplay.
I cannot quite see how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is present in the answer.
'good' could be 'g' (abbreviation) and 'g' is present in the answer.
'cause' could be 'striker' (striker is a kind of cause) and 'striker' is found in the answer.
The remaining letters 'her' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'to' acts as a link.