Show regret about enclosure with first of texts (6)
I believe the answer is:
repent
'show regret' is the definition.
'repent' can be an answer for 'regret' (I've seen this before). I am not certain of the 'show' bit.
'about enclosure with first of texts' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'enclosure' becomes 'pen' (pen is a kind of enclosure).
'with' means one lot of letters go next to another.
'first of texts' becomes 't' (1st letter of 'texts').
're'+'pen'+'t'='REPENT'
Can you help me to learn more?
(Other definitions for repent that I've seen before include "Turn away from sin" , "Feel sincere regret" , "Feel or express contrition" , "Deplore" , "Be sorry for - . . . . . . ye sinners" .)