Possible Clues:

• Head of pin piercing bug for study
• Comb through
• Check fly, say, with pants originally buttoned up
• Bookworm, say, taking in page in study
• Look at Portugal's capital -- perhaps fly around it
• Look at cricket, for example, to catch Pakistan's opener
• ... bug's kept quietly for study
• Examine west end of pitch during cricket?
• Scrutinise monarch, for example, holding power
• Possibly beetle around quiet study