... she cut everything back (8)

I believe the answer is:

prunella

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'she' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'cut everything back' is the wordplay.
'cut' becomes 'prune' (synonyms).
'everything' becomes 'all' (all things).
'back' is a reversal indicator.
'all' in reverse letter order is 'lla'.
'prune'+'lla'='PRUNELLA'

Can you help me to learn more?

(Other definitions for prunella that I've seen before include "climbing plant" , "flower" , "Strong silk" , "It reputedly heals everyone" , "Silk fabric" .)

I've seen this clue in The Irish Times.

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