The meaning of the underlined word "clandestine" is- secret.
• Clandestine (Adj)
Bangla Meaning: গোপন; গুপ্ত।
English Meaning: marked by, held in, or conducted with secrecy .
• Secret (Adj)
Bangla Meaning: গোপন; গোপনীয়; গুপ্ত; গূঢ়; সংগুপ্ত:।
English Meaning: kept from knowledge or view : hidden।
Other options:
• Counterfeit (Adj, noun)
Bangla Meaning: জাল; নকল; কৃত্রিম; জাল টাকা; নকল হীরা; কৃত্রিম শোক।
English Meaning: made in imitation of something else with intent to deceive : forged.
• Undesirable (Adj)
Bangla Meaning: অস্পৃহ্য; অনাকাঙ্ক্ষ্য; অবাঞ্ছিত; অনাকঙ্ক্ষিত।
English Meaning: not desirable : unwanted.
• Close (verb)
Bangla Meaning: বন্ধ করা; বন্ধ হওয়া।
English Meaning: to move so as to bar passage through something.
Source: Merriam-Webster Dictionary, Accessible Dictionary.