Possible Clues:

• Provides cover for detective's target around institute associated with rag trade
• Like detectives sporting civvies
• Plan to cover individual costumes for Garda who wants to fit in
• Act of bringing together (sides in dispute)
• Obvious fool, he's a sort of detective
• All the cops in newly-designed uniform? Wrong
• Type of detective
• Variation in phone call - it's not uniform
• Out-of-uniform cops in lethal exchange
• Policeman's non-uniform wear