Fortune-teller getting cavalry into trouble (11)
I believe the answer is:
clairvoyant
'fortune-teller' is the definition.
(I've seen this before)
'getting cavalry into trouble' is the wordplay.
'getting' says to put letters next to each other.
'trouble' indicates an anagram.
'cavalry' after 'into' is 'intocavalry'.
'intocavalry' is an anagram of 'CLAIRVOYANT'.
(Other definitions for clairvoyant that I've seen before include "diviner" , "Able to see the future" , "visionary" , "Madame Arcaty?" , "Psychic" .)