Decline the opportunity to all raise kitty at a push initially (4,2)
I believe the answer is:
pass up
'decline' is the definition.
('pass up' can be a synonym of 'decline')
'raise kitty at a push initially' is the wordplay.
'raise' shows that the letters should be reversed in order.
'kitty' becomes 'puss' ('puss' can be a synonym of 'kitty'**).
'initially' indicates taking the first letters.
The initial letters of 'at push' is 'ap'.
'puss'+'ap'='pussap'
'pussap' reversed gives 'PASS UP'.
'the opportunity to all' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for pass up that I've seen before include "Fail to take advantage of" , "forego" , "Neglect (an opportunity)" , "Turn (something) down" , "col?" .)