Excited remark from man entertained by compilers (4)
I believe the answer is:
whee
'excited remark' is the definition.
'man entertained by compilers' is the wordplay.
'man' becomes 'he' (he refers to a man).
'entertained by' means one lot of letters goes inside another (inserted letters are hosted or entertained).
'compilers' becomes 'we' (the crossword compiler and their colleagues).
'he' placed inside 'we' is 'WHEE'.
'from' is the link.
(Other definitions for whee that I've seen before include "Exuberant cry" , "Cry from someone going downhill fast?" , "I'm going downhill, fast!" , "What fun" , "Expression of delight" .)