Macho discipline from one in suit? (5)

I believe the answer is:

heart

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'one in suit?' is the definition.
'heart' can be an answer for 'suit?'. I'm not certain of the 'one in' bit.

'macho discipline' is the wordplay.
'macho' becomes 'he' (I am not sure about this - if you are sure you should believe this answer much more).
'discipline' becomes 'art' (I've seen this in another clue).
'he'+'art'='HEART'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for heart that I've seen before include "Centre; core" , "Muscular organ - compassion" , "show enthusiasm" , "See 22" , "Muscular organ for blood circulation" .)

I've seen this clue in the Sydney Morning Herald.

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