Plead wildly for less than a penny-farthing! (5)
I believe the answer is:
pedal
'less than a penny-farthing' is the definition.
I can't tell whether this defines the answer.
'plead wildly' is the wordplay.
'wildly' indicates an anagram.
'plead' anagrammed gives 'PEDAL'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for pedal that I've seen before include "Lever worked by foot" , "Foot-lever" , "ride a cycle" , "Bicycle footrest" , "Power a bike" .)