Crossword Genius

Gave in rent sporadically, causing one to feel drained of energy (10)

Ross

I believe the answer is:

enervating

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'drained of energy' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs can sometimes mean the same thing.

'gave in rent sporadically causing one to feel' is the wordplay.
'gave in rent' anagrams to 'ENERVATING'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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