Grumpy type Republican put in taxi (4)
I believe the answer is:
crab
'grumpy type' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'republican put in taxi' is the wordplay.
'republican' becomes 'r' (abbreviation).
'put in' means one lot of letters goes inside another.
'taxi' becomes 'cab' (synonyms).
'r' put within 'cab' is 'CRAB'.
Can you help me to learn more?
(Other definitions for crab that I've seen before include "Clawed shellfish" , "Fiddler, perhaps" , "Seashore creature" , "one is a fiddler" , "Sour character" .)