Thus extensive genetic fingerprint reversal cheers in respect of complete school book (2,4,3,6,3,3,3,4)
I believe the answer is:
so long and thanks for all the fish
'thus extensive genetic fingerprint reversal cheers in respect of complete school book' is the definition.
I can't judge whether this defines the answer.
'thus extensive genetic fingerprint reversal cheers in respect of complete school' is the wordplay.
I cannot quite see how this works, but
'thus' could be 'so' (synonyms) and 'so' is located in the answer.
'extensive' could be 'long' (I've seen this in another clue) and 'long' is present in the answer.
'cheers' could be 'thanks' ('cheers' can informally mean 'thank you') and 'thanks' is found within the answer.
'of' could be 'o' and 'o' is located in the answer.
'complete' could be 'all' (similar in meaning) and 'all' is present in the answer.
'school' could be 'fish' (group of fishes) and 'fish' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for so long and thanks for all the fish that I've seen is " work of 16 12 [DOUGLAS ADAMS] - with 24d,11a,9d".)