### Clue: Bowling initially for a short time, puffs hard and quickly, perhaps (7)
### Answer: ADVERBS 
 ### Explanation: Definition: hard and quickly, perhaps
  "Adverts"{puffs (as a noun),advertisements that unduly praise or exaggerate} with "b"(initial letter,initially of "bowling") replacing(for) "t"(abbrev.,short of "$$t$$ime").
Answer: Examples of which,perhaps are "hard" and "quickly".  Trickiest clue, I found.