Flashing beam - the middle of three? (5)
I believe the answer is:
amber
'flashing beam the middle of three?' is the definition.
I can't tell whether this defines the answer.
'flashing beam the middle of three?' is the wordplay.
'flashing' indicates anagramming the letters (flash can mean to move around).
'the middle of' means to look at the middle letters.
The central letter of 'three' is 'r'.
'beam' with letters rearranged gives 'ambe'.
'ambe'+'r'='AMBER'
Can you help me to learn more?
(Other definitions for amber that I've seen before include "Yellow-brown colour as of bream" , "Deep yellow" , "Fossil resin - warning light" , "A yellowy resin" , "Dark yellow" .)