Look at the big end, man! (6)
I believe the answer is:
glance
'look at' is the definition.
(I've seen this before)
'big end man' is the wordplay.
'end' indicates one should take the final letters.
'man' becomes 'lance' (man's name).
The final letter of 'big' is 'g'.
'g'+'lance'='GLANCE'
'the' is the link.
(Other definitions for glance that I've seen before include "Oblique impact" , "Flash" , "Peek" , "Look quickly at -- cricket stroke" , "A brief or casual look" .)