Fruit with bulges Penny moved to the front (5)

I believe the answer is:

plums

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

'penny moved to the front' is the definition.
I can't tell whether this definition defines the answer.

'fruit with bulges' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'with' is a charade indicator (letters next to each other).
'bulges' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plum'+'s'='PLUMS'

Can you help me to learn more?

I've seen this clue in The Independent.

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