Baffled, fled without uranium, gentlemen and animal (9)
I believe the answer is:
flummoxed
'baffled' is the definition.
('flummox' can be a synonym of 'baffle')
'fled without uranium gentlemen and animal' is the wordplay.
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'uranium' becomes 'U' (U is the chemical symbol for uranium).
'gentlemen' becomes 'mm' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'animal' becomes 'ox' (I've seen this in other clues).
'u'+'mm'+'ox'='ummox'
'fled' placed around 'ummox' is 'FLUMMOXED'.
Can you help me to learn more?
(Other definitions for flummoxed that I've seen before include "Stumped" , "at sea" , "thrown" , "at a loss" , "Confounded" .)