Split from extremely clever First Lady hiding fool (8)
I believe the answer is:
crevasse
'split' is the definition.
(thesaurus)
'extremely clever first lady hiding fool' is the wordplay.
'extremely' suggests removing the centre.
'first lady' becomes 'eve' (I've seen this before).
'hiding' indicates putting letters inside.
'fool' becomes 'ass' (ass is a kind of fool**).
'clever' with its middle taken out is 'cr'.
'eve' going around 'ass' is 'evasse'.
'cr'+'evasse'='CREVASSE'
'from' is the link.
(Other definitions for crevasse that I've seen before include "climbing hazard in glacier" , "opening" , "Deep glacial fissure" , "Sever sac (anag)" , "Deep open crack as in glacier" .)