With which dashing fellow cuts a figure? (5)
I believe the answer is:
blade
'with which dashing' is the definition.
I can't tell whether this definition defines the answer.
'fellow cuts a figure?' is the wordplay.
I cannot really see how this works, but
'fellow' could be 'lad' (synonyms) and 'lad' is found within the answer.
'figure?' could be 'be' (figuring is a kind of being) and 'be' is found in the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for blade that I've seen before include "cutter" , "Flat part of an oar" , "London rail terminus" , "Cutting edge" , "Leaf, of grass, say" .)