Cheers horse -- mine, of sorts? (3,4)
I believe the answer is:
tap into
'mine of sorts?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'cheers horse' is the wordplay.
'cheers' becomes 'ta' (both can informally mean thank you).
'horse' becomes 'pinto' (pinto is a kind of horse).
'ta'+'pinto'='TAP INTO'
Can you help me to learn more?
(Other definitions for tap into that I've seen before include "Secretly gain access to" , "gain illegal access" .)