Crossword Genius

Cost to fill tank (6)

Ross

I believe the answer is:

charge

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

This might be a double definition.

'cost' is the first definition.
(charge is a kind of cost)

'fill tank' is the second definition.
'charge' can be an answer for 'fill' (charging is a kind of filling). I am unsure of the 'tank' bit.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for charge that I've seen before include "Amount to pay - attack" , "Control" , "Move quickly and violently" , "Ask for" , "damage" .)

I've seen this clue in The Sun.
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