Foresee monarch being put into power with decree (7)
I believe the answer is:
predict
'foresee' is the definition.
(thesaurus)
'monarch being put into power with decree' is the wordplay.
'monarch' becomes 'r' (r is abbreviation for rex).
'being put into' indicates putting letters inside.
'power' becomes 'p'.
'with' says to put letters next to each other.
'decree' becomes 'edict' (I've seen this before).
'p'+'edict'='pedict'
'r' put inside 'pedict' is 'PREDICT'.
(Other definitions for predict that I've seen before include "Anticipate" , "Estimate consequence of" , "act as oracle" , "Guess (the future)" , "Prophesy - portend" .)