Answer: delves

AnswerCrossword Clue
DELVES

Searches laboriously

DELVES

Digs deep

DELVES

Investigates, with "into"

DELVES
Probes, with "into"
DELVES
Digs deeper
DELVESDigs deeply
DELVESDigs (into)
DELVESDigs.
DELVESDoes research.
DELVESDoes intensive research
DELVESDigs for data
DELVESDigs into
DELVESSearches the archives
DELVESDigs deeply (into)
DELVESGoes deep (into)
DELVESLooks closely (into)