Crossword Clue:

to mark the limits of

Answer	Crossword Clue
STRAIN	Push to the limits
TAUT	Stretched to the limits
EXURB	Where to live beyond the limits

SEGNO	Mark at the beginning or end of music to be repeated
FALLGUY	Easy mark ... and a hint to the starts of the answers to starred clues
THEME	Adding certain letters to phrases to mark the 30th anniversary of the seminal "Elk Cloner" computer virus, e.g.