Crossword Genius

Firm line taken in balancing act (9)

Ross

I believe the answer is:

tightrope

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'taken in balancing act' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'firm line' is the wordplay.
'firm' becomes 'tight' (synonyms).
'line' becomes 'rope' (rope is a kind of line).
'tight'+'rope'='TIGHTROPE'

Can you help me to learn more?

(Other definitions for tightrope that I've seen before include "Difficult thing to walk on" , "Acrobats perform on it, usually with safety net" , "- - -walker" , "Cable on which acrobatics are performed" , "High wire" .)

I've seen this clue in The Sun and The Telegraph.
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