Respond again to hatless fellows going in to perform again (2-5)

'respond again' is the definition.
I can't judge whether this defines the answer.

'hatless fellows going in to perform again' is the wordplay.
'hatless' means to remove the first letter (the hat of the word is its first letter).
'fellows' becomes 'men' (I've seen this before).
'going in' means one lot of letters goes inside another.
'to perform again' becomes 'react' ('act' is an answer for 'to perform' so perhaps 'react' is OK for 'to perform again').
'men' with its first letter taken off is 'en'.
'en' going into 'react' is 'RE-ENACT'.

'to' is the link.

Can you help me to learn more?