Crossword puzzle clue "tiring and tedious gathering of basic information etc"

Here are the possible solutions for tiring and tedious gathering of basic information etc clue

Answer
Clue
Relevancy
legwork
Clue
Tiring and tedious gathering of basic information etc
Definition
work that involves lots of walking
arduous
Clue
Difficult and tiring
Definition
laborious
cia
Clue
Information-gathering federal organization: Abbr.
Information-gathering org.
Information-gathering grp.
data
Clue
___ mining (information gathering)
Definition
DATUM, (Latin) something used as a basis for calculating
recon
Clue
Information-gathering mission
Information gathering session
Definition
to conduct a preliminary survey

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