Crossword Genius

Concerning muscle contractions, getting treated is costly (8)

Ross

I believe the answer is:

systolic

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

'concerning muscle contractions getting' is the definition.
I can't judge whether this defines the answer.

'treated is costly' is the wordplay.
'treated' is an anagram indicator.
'is'+'costly'='iscostly'
'iscostly' anagrammed gives 'SYSTOLIC'.

Can you help me to learn more?

(Other definitions for systolic that I've seen before include "Relating to the heart's contracting phase" , "on the beat" , "Blood pressure when the heart is contracting" , "To do with rhythmic contraction of heart chambers" .)

I've seen this clue in The Guardian.
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