Discretion

5 clues
Free will
Good judgment
Blabber's lack
Tact — prudence
The better part of valor
Similar answers:
Accretion
Completion
Deletion
Deletions
Depletion
Discredit
Discreditcards
Discreditdepartment
Discredited
Discreditunion
Discreet
Discreets
Discrentaled
Discrepancy
Discrepant
Discrete
Discretion
Discriminate
Discriminated
Discriminates