Crossword Genius

Power supplier's selfie ruined in combat (6,4)

Ross

I believe the answer is:

diesel fuel

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

'power supplier's' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'selfie ruined in combat' is the wordplay.
'ruined' indicates anagramming the letters.
'in' is an insertion indicator.
'combat' becomes 'duel' (duel is a kind of combat).
'selfie' is an anagram of 'ieself'.
'ieself' placed inside 'duel' is 'DIESEL FUEL'.

Can you help me to learn more?

I've seen this clue in The Independent.
Want a hint initially instead of a full solution? Install my app