You once strayed badly, very recently (9)
I believe the answer is:
yesterday
'very recently' is the definition.
(I've seen this before)
'you once strayed badly' is the wordplay.
'you once' becomes 'ye' (archaic version of 'you').
'badly' is an anagram indicator (letters in the wrong order).
'strayed' with letters rearranged gives 'sterday'.
'ye'+'sterday'='YESTERDAY'
(Other definitions for yesterday that I've seen before include "of most recent history" , "Beatles hit - Thursday" , "not so long ago" , "some time in the past" , "back then" .)