Charlie and Clyde foolishly took a bike (6)
I believe the answer is:
cycled
'took a bike' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'charlie and clyde foolishly' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' is a charade indicator (letters next to each other).
'foolishly' is an anagram indicator.
'clyde' is an anagram of 'ycled'.
'c'+'ycled'='CYCLED'
Can you help me to learn more?
(Other definitions for cycled that I've seen before include "Went by push-bike" , "Biked" , "Went by bicycle" , "Went round and round - on bike?" , "Rode" .)