Here are the possible solutions for fictional figure able to change form at will preheats fish anag clue
Answer
Clue
Relevancy
shapeshifter
Clue
Fictional figure able to change form at will — preheats fish (anag)
The spearfish (anag) — mythical being that can change its form
inflexion
Clue
Change in a word's grammatical form — fix online (anag)
Definition
a change in the form of a word, usually modification or affixation, signalling change in such grammatical functions as tense, voice, mood, person, also INFLECTION
protean
Clue
Able to change shape
Definition
having a varied nature or ability to assume different forms
vagary
Clue
Unexpected and inexplic-able change
prehensile
Clue
Able to grasp an object — Helen is rep (anag)
Definition
adapted to seize or grasp, esp. by wrapping round; as, the prehensile tail of a monkey, also PREHENSIVE, PREHENSORIAL, PREHENSORY