For one promoter going round it's horrible - stay strong! (5,2,3)

'stay strong' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'for one promoter going round it's horrible' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'round' could be 'o' (o is a circular letter) and 'o' is found in the answer.
'horrible' could be 'ugh' (expression of disgust) and 'ugh' is found within the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
The remaining letters 'ut' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?