Get ready quickly? Crossword Clue

(grammar, strict sense) Any of a class of non-inflecting words typically employed to connect a following noun or a pronoun, in an adjectival or adverbial sense, with some other word: a particle used with a noun or pronoun (in English always in the objective case) to make a phrase limiting some other word.

An anagram of the answer is "RPEP"

Can also mean "PREP"

Another clue for the same answer is Get ready, for short

The first letter of the answer is "P"