Be slow to give £1 to a politician (4)
I believe the answer is:
limp
'be slow' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'give ps1 to a politician' is the wordplay.
'give' means one lot of letters go next to another.
'psl' becomes 'li' (I can't justify this - if you can you should believe this answer much more).
'to a politician' becomes 'MP' (Member of Parliament).
'li' next to 'mp' is 'LIMP'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for limp that I've seen before include "Lacking stiffness" , "Walk with difficulty" , "Walk with an injury" , "Walk with an uneven stop" , "exhausted" .)