Crossword Genius

On time to help erring actor? (6)

Ross

I believe the answer is:

prompt

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This could be a double definition.

'on time' is the first definition.
(synonyms)

'help erring actor?' is the second definition.
'prompt' can be an answer for 'help' (thesaurus). I am unsure of the 'erring actor?' bit.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for prompt that I've seen before include "Punctual or timely" , "keeping to the right time" , "Immediate - supply actor's lines" , "Refresh the memory -- on time" , "effective in expedition" .)

I've seen this clue in The Sun.
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