Summit leader in crisis (4)
I believe the answer is:
head
'crisis' is the definition.
(thesaurus)
'summit leader in' is the wordplay.
'summit' becomes 'had' (I can't justify this - if you can you should give a lot more credence to this answer).
'leader' becomes 'e' (I've seen this in other clues).
'in' indicates putting letters inside.
'had' going around 'e' is 'HEAD'.
Can you help me to learn more?
(Other definitions for head that I've seen before include "Leader; front" , "Leader; stream source" , "Leader; promontory" , "Be in charge of; (come to) crisis" , "bean" .)