Bishop with lamp maybe revealing plant disease (6)
I believe the answer is:
blight
'revealing plant disease' is the definition.
'blight' can be an answer for 'disease' (blight is a kind of disease). I am not sure about the 'revealing plant' bit.
'bishop with lamp' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'with' says to put letters next to each other.
'lamp' becomes 'light' (I've seen this before).
'b'+'light'='BLIGHT'
'maybe' acts as a link.
Can you help me to learn more?
(Other definitions for blight that I've seen before include "Problem of plants or urban development" , "Fungal plant disease" , "Affliction" , "Plant disease -- calamity" , "Pestilence - state of decay" .)