One travelling round city tackles left-hand side of Angel's puzzle (7)
I believe the answer is:
tangram
'puzzle' is the definition.
(I know that tangram is a type of puzzle)
'one travelling round city tackles left-hand side of angel's' is the wordplay.
I cannot really see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is located in the answer.
'hand' could be 'r' (abbreviation for right, as in the right-hand side) and 'r' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tangram that I've seen before include "Chinese puzzle - arm gnat (anag)" , "it's puzzling for a Pekingese" , "Chinese puzzle with shapes" .)