One doggedly wagged? (4)
I believe the answer is:
tail
'doggedly wagged?' is the definition.
The answer and definition are different parts of speech. However, past participle verbs and adjectives can occasionally define each other.
'one' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
The remaining letters 'tal' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for tail that I've seen before include "Shadow" , "Follow - train" , "Follow the caudal appendage" , "Hindmost part" , "Animal's elongated appendage" .)