If it's bad fuel, it is useless (6)

I believe the answer is:

futile

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'if it's bad' is the definition.
I can't judge whether this definition defines the answer.

'fuel it is useless' is the wordplay.
'is useless' indicates anagramming the letters.
'fuel'+'it'='fuelit'
'fuelit' is an anagram of 'FUTILE'.

Can you help me to learn more?

(Other definitions for futile that I've seen before include "Useless, pointless" , "Useless, a waste of effort" , "Effectless" , "Pointless, a waste of effort" , "Ineffectual,in vain" .)

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