Answer:

pith

Answer	Crossword Clue
PITH	Central part
PITH	Essence
PITH	Kind of helmet

PITH	Brevity
PITH	Core
PITH	Heart of the matter
PITH	Essence or core
PITH	Importance
PITH	Heart
PITH	Nitty-gritty
PITH	.. helmet: safari wear

PITH	Vital part
PITH	Bare bones
PITH	Safari helmet material
PITH	Essential part
PITH	Helmet type
PITH	... helmet (safari wear)
PITH	Important part
PITH	Part of a plant stem

PITH	Kind of helmet in safari films
PITH	Substantial meaning
PITH	Soft core
PITH	Spongy tissue in fruit
PITH	Sun-hat material
PITH	Substance
PITH	.. helmet
PITH	Safari helmet

PITH	Jungle helmet material
PITH	Helmet material
PITH	Main point.
PITH	Essence.
PITH	Material for a helmet.
PITH	Spongy substance in an orange.
PITH	Essential part.
PITH	Kernel.

PITH	Substance.
PITH	Soft substance in stem plants.
PITH	Core.
PITH	Marrow
PITH	Meat of the matter