Lively chap I wed loses head (8)
I believe the answer is:
animated
'lively' is the definition.
(similar in meaning)
'chap i wed loses head' is the wordplay.
'chap i' becomes 'anim' (I can't justify this - if you can you should give a lot more credence to this answer).
'wed' becomes 'mated' (I've seen this in another clue).
'loses head' means to remove the first letter.
'mated' with its first letter taken off is 'ated'.
'anim'+'ated'='ANIMATED'
Can you help me to learn more?
(Other definitions for animated that I've seen before include "Interesting and lively - as a cartoon film is" , "Lively in diamante" , "full of spirit" , "Mandate I got to be lively" , "Enlivened (like a cartoon film)" .)