Delay, putting nothing unusual in stable (9)
I believe the answer is:
stonewall
'delay' is the definition.
(I know that stonewall is a kind of delay)
'nothing unusual in stable' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'unusual' becomes 'new' (new can mean unusual or different).
'in' indicates putting letters inside.
'stable' becomes 'stall' (I've seen this in other clues).
'o'+'new'='onew'
'onew' inserted inside 'stall' is 'STONEWALL'.
'putting' is the link.
(Other definitions for stonewall that I've seen before include "Obstruct by refusing to answer questions" , "Delay or block (a proposal's) progress" , "Play or obstruct defensively" , "Obstruct or hinder any discussion" , "delay in parliament" .)