As a seasoned detective, my first instinct was to break down the word ‘groupie‘ and examine its individual parts. The suffix ‘ie‘ typically denotes a diminutive or a term of endearment, which immediately suggested to me that this word may refer to someone who idolizes or adores a particular group or individual. Given the number of letters in the crossword clue, I quickly ruled out more complex words such as ‘enthusiast‘ or ‘devotee‘. Instead, I honed in on a three-letter word that could embody the sense of passionate devotion or adoration implied by the word ‘groupie‘. The answer seemed obvious. A FAN. Yes, ‘fan‘ indeed encapsulates the meaning of someone who unreservedly supports a celebrity or group, going to great lengths to follow them and show their love. This was the answer to the crossword clue ‘groupie‘. Case closed.