Special constable starts to take country walks and do some climbing (8)
I believe the answer is:
scramble
'do some climbing' is the definition.
(I've seen this before)
'special constable starts to take country walks' is the wordplay.
'starts to' indicates taking the first letters.
'take' says to put letters next to each other.
'country walks' becomes 'ramble' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letters of 'special constable' is 'sc'.
'sc'+'ramble'='SCRAMBLE'
'and' is the link.
Can you help me to learn more?
(Other definitions for scramble that I've seen before include "Make one's way with disorderly haste" , "cross-country race" , "Distort radio signal" , "motorcycle trial" , "race over rough terrain" .)