Possible Clues:

• Get scientific in sport
• Catch with line perhaps, being skilful
• Chance it maybe - the trainee appears practical
• Specialised kind of college
• Arranged nice chat with learner in one sort of college
• Catch line that's thrown, requiring special skill
• Industrial and kind of foul
• Specialist catch with line at sea
• According to a strict interpretation of the rules — I catch Len (anag)
• Doubtfully ethical, involving separate new chapter requiring special knowledge