Weaken in spirit, even run maybe (7)

I believe the answer is:

unnerve

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'weaken in spirit' is the definition.
'unnerve' can be an answer for 'weaken' (I've seen this in another clue). I'm not certain of the 'in spirit' bit.

'even run maybe' is the wordplay.
'maybe' is an anagram indicator.
'even'+'run'='evenrun'
'evenrun' is an anagram of 'UNNERVE'.

Can you help me to learn more?

(Other definitions for unnerve that I've seen before include "Make one get in a fluster" , "Dishearten - discourage" , "scare" , "Cause to lose courage - even run away" , "Frighten" .)

I've seen this clue in The Irish News.

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