Bachelor consumed by drink at party and that's a reflection of what's on the surface (6)
I believe the answer is:
albedo
'that's a reflection of what's on the surface' is the definition.
I can't judge whether this definition defines the answer.
'bachelor consumed by drink at party' is the wordplay.
'bachelor' becomes 'B' (abbreviation e.g. BA=Bachelor of Arts).
'consumed by' means one lot of letters goes inside another (inserted letters get consumed).
'drink' becomes 'ale' (type of beer).
'at' means one lot of letters go next to another.
'party' becomes 'do' (do is a kind of party).
'b' going within 'ale' is 'albe'.
'albe'+'do'='ALBEDO'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for albedo that I've seen before include "Measure of a surface's reflectivity" , "Measure of planet's reflection" , "Measure of reflectiveness, doable (anag.)" , "Proportion of light a planet reflects" , "Reflecting power" .)