Please speak about this sofa on a regular basis (7)
I believe the answer is:
satisfy
'please' is the definition.
(to satisfy someone is to please them)
'speak about this sofa on a regular basis' is the wordplay.
'speak' becomes 'say' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'on a regular basis' indicates alternate letters.
'this'+'sofa'='thissofa'
The alternate letters of 'thissofa' are 'tisf'.
'say' placed around 'tisf' is 'SATISFY'.
(Other definitions for satisfy that I've seen before include "Fulfil, gratify" , "Fulfil, a desire or need" , "To convince" , "Be good enough for" , "Please; comply with" .)