Crossword Genius

I will stop taking additive, having initial frailty (3-6)

Ross

I believe the answer is:

ill-health

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

'frailty' is the definition.
(thesaurus)

'i will stop taking additive having initial' is the wordplay.
I cannot really understand how this works, but
'i' could be 'a' and 'a' is found within the answer.
'will' could be 'll' (contracted form, as in 'he'll' - 'he will') and 'll' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ill-health that I've seen before include "Unfitness" , "Sickness" , "Poor physical condition" , "Unwellness" .)

I've seen this clue in The Daily Express.
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