Perhaps hippo suffering cramp around London park (9)
I believe the answer is:
pachyderm
'perhaps hippo' is the definition.
I can't tell whether this definition defines the answer.
'suffering cramp around london park' is the wordplay.
'suffering' indicates an anagram.
'around' means one lot of letters goes inside another.
'london park' becomes 'hyde' (I've seen this before).
'cramp' anagrammed gives 'pacrm'.
'pacrm' going around 'hyde' is 'PACHYDERM'.
Can you help me to learn more?
(Other definitions for pachyderm that I've seen before include "Insensitive sort" , "Large mammal" , "Large hoofed animal with a very thick skin" , "Thick-skinned beast, such as a rhino" , "One thick-skinned" .)