Regret penning English verse for show (5)
I believe the answer is:
revue
'show' is the definition.
(revue is a kind of show)
'regret penning english verse' is the wordplay.
'regret' becomes 'rue' (synonyms).
'penning' indicates putting letters inside.
'english' becomes 'e' (abbreviation).
'verse' becomes 'v'.
'e'+'v'='ev'
'rue' enclosing 'ev' is 'REVUE'.
'for' is the link.
(Other definitions for revue that I've seen before include "Entertainment consisting of sketches" , "Show of sketches, songs, etc" , "Song and dance entertainment" , "Theatrical show" , "Stage entertainment with sketches, songs and dance" .)