Really perform with partner, about undressed initially (8)
I believe the answer is:
actually
'really' is the definition.
(I've seen this before)
'perform with partner about undressed initially' is the wordplay.
I cannot quite understand how this works, but
'perform' could be 'act' (acting is a kind of performing) and 'act' is found within the answer.
'partner' could be 'ally' (I've seen this in other clues) and 'ally' is found within the answer.
A single letter 'u' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for actually that I've seen before include "Really existing" , "A lay cult may be existing in fact" , "Really, in fact" , "As a matter of fact" , "In reality" .)