Ugly dwarf in part of Austria, not unknown having doubled back (5)
I believe the answer is:
troll
'ugly dwarf' is the definition.
(I've seen this before)
'part of austria not unknown having doubled back' is the wordplay.
'part of austria' becomes 'Tyrol' ('Tyrol' is part of 'austria').
'not' is a deletion indicator.
'unknown' becomes 'y' (algebra).
'having' is a charade indicator (letters next to each other).
'doubled back' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tyrol' with 'y' removed is 'trol'.
'trol'+'l'='TROLL'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for troll that I've seen before include "Fish with a moving bait" , "Scandinavian monster" , "who's stirring on-line" , "Scandinavian dwarf or giant" , "Try to catch fish" .)