Burning dish of fluid threw off beam (6)
I believe the answer is:
flambe
'burning dish' is the definition.
'flambe' can be an answer for 'burning' (as in flambe cooking). I'm not certain of the 'dish' bit.
'fluid threw off beam' is the wordplay.
'fluid' becomes 'F' (F is an example).
'threw' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'off' indicates anagramming the letters.
'beam' with letters rearranged gives 'ambe'.
'f'+'l'+'ambe'='FLAMBE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for flambe that I've seen before include "(Of food) served in alcohol and set alight" , "cooked in blazing brandy" , "Of food, sprinkled with alcohol and set alight" , "Pour liquor over a dish and ignite" , "Burnt" .)