Peck Kaiser's ear off? (4)
I believe the answer is:
kiss
'peck' is the definition.
(I've seen this before)
'kaiser's ear off?' is the wordplay.
'off?' is a deletion indicator (some letters taken off).
'kaisers' with 'ear' taken out is 'KISS'.
(Other definitions for kiss that I've seen before include "lightness of touch?" , "Neck - peck" , "x (that may be French)" , "Smack; peck" , "drop of wax" .)