Revised lab fee is practical and realistic (8)
I believe the answer is:
feasible
'realistic' is the definition.
(thesaurus)
'revised lab fee is' is the wordplay.
'revised' indicates an anagram.
'lab'+'fee'+'is'='labfeeis'
'labfeeis' with letters rearranged gives 'FEASIBLE'.
'practical and' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for feasible that I've seen before include "Capable of being done" , "Able to be effected" , "Easily possible to do" , "Practicable and possible" , "is likely to work" .)