Crossword Genius

Rocket engine with discoloration in charger? (9)

Ross

I believe the answer is:

sustainer

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'rocket engine' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'discoloration in charger?' is the wordplay.
'discoloration' becomes 'stain' (synonyms).
'in' means one lot of letters goes inside another.
'charger?' becomes 'suer' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stain' put inside 'suer' is 'SUSTAINER'.

'with' acts as a link.

Can you help me to learn more?

(Another definition for sustainer that I've seen is " Supporter".)

I've seen this clue in The Times.
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